Shoutbox

Wireless internet works by transmitting the signal for internet wirelessly (in a similar way to how walkie talkies work, to put it in basic terms)

To get wireless internet you need a wireless router which plugs into your internet/phone socket to get the connection, it then distibutes that connection wirelessly

Most recent laptops (ones that are less than about 3/4 years old) will have a wireless receiver built into them so will be able to connect to it

Your PC may not have a wireless connection, but you can still use ethernet to connect to a wireless router in the same way you are doing now (and it is recommended that at least one computer is connected to the router by a wire)

Each router has different options, etc, but most provide wireless security (so that neighbours can't access your connection)

This is in the form of a password which you will enter when connecting to the wireless (it becomes clearer when you have the stuff and can try things out)

I hope this is enough to give you the very basics and to get you on your way.  If you have any more specific questions then I (or someone else) can help you with those too